By air, land and sea - the nation's largest counter-terrorism squad is on the beat in America's largest city. One thousand officers - many of them armed like soldiers - are part of a presence that is meant to send a message: New York City is too tough a target. NYPD counter-terrorism is the creation of police Commissioner Ray Kelly.

Ray Kelly: We're the number one target in this country. That's the consensus of the intelligence community. We're the communications capital. We're the financial capital. We're a city that's been attacked twice successfully. We've had 13 terrorist plots against the city since September 11. No other city has had that.

Kelly is a classic cop. He started as an NYPD cadet and rose all the way to commissioner. He left the force before 9/11. But within four months of the attack, the mayor asked him to come back.